Steam-boiler



' (No Model.)

W. W. GARMAN.

STEAM BOILBR. No. 317,503. l Patented May 12, 1885.

Il 11ml U N. PETERS. Fhaw-Llhngraphur. wnnmgwn. D4 C.

UNITED STATES PATENT OFFICE.

WILLIAM WALLACE CARMAN, OF EXETER, NEW HAMPSHIRE.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 317,503, dated May l2, 1885.

Application led January 5, 1885.

' panying drawing, which is a longitudinal section of a boiler containing my invention, the nature of which is defined by the claim hereinafter presented.

In the said drawing, A is what is termed a steam-drum,7 it being a hollow cylinder closed at its ends, and having its axis horizontal, or about so. In iront of and extending below the said drum is a water tight box or vessel, B, that near its upper end opens into the drum, near the lower part thereof, by a conduit, a. Leading out of the said box or vessel B, and inclined relatively to the steam-drum as represented, is a series of pipes, Q, each of which by an elbow, D, opens into one ot' another series of pipes, E, extending downward and leading into another water-tight box or vessel, F, inclined like the pipes G. A pipe, Gr, leads out of the lower part of the box F, and thence upward, and opens into the rear end or head of the steam drum on or about on a level with the conduit a. The boiler so constructed is suitably arranged in whole or in part Within a heating-chamber, H, above, or provided with a fire-place, l, having a grate, K, and ash-pit L, a smoke-discharge flue, M, leading out of the lower part of such chamber. The upright part of the pipe Gr, I have outside of the chamber H, as represented, in order that the said part of the pipe may indicate by its temperature the rapidity or degree of circulation of the water through the generator.

When the boiler is in operation, the smoke and heated volatile product-s of combustion pass from the fire-place into and through the (No model.)

chamber H and between and around the' pipes C and E and the boxes B and F, they at the time being filled with water, which also is to extend within the stealndrum to a level above the conduit c. As the water becomes heated it will circulate from the box F up through the pipes E, elbows D, pipes C, box B, steamdrum A, and from the latter will flow into and down the pipe G, and thence back into the box F, the steam generated from the water remaining within the drum A, from whence it may be drawn for being utilized as occasion may require. Each of the boxes B and F extends entirely across the heating-chamber H.

I am aware of and do not claim the steamboiler described and represented in the United States Patents No. 84,607 and No. 288,178, in each of which, instead of one single box at each of the ends ot'the series or stack oi tubes, there is a series of separate boxes, headers,77 or manifolds,77 a construction which, on account of its great expansion, comparatively speaking, and the diticulty of keeping free from sedimentary deposits, I avoid by having single boxes to extend entirely across the heatingchamber.

I claim- The combination of the tire-place I and the smoke-chamber H with the steam-drum arranged in the upper part of and extending upward out of and above such chamber, the two boxes B and F, extending across the said chamber in its upper and lower parts, the pipes a and Gr, connecting such drum and boxes, and the stacks of pipes G and E, connected by elbows D, and opening into and extended from one to the other of the said boxes and within the chamber H, all being substantially as set forth.

VILLIAM VALLAGE GARMAN.

Witnesses Hy W. HOWELL, EDWARD FORD. 

